GAS TURBINE & COMBINED CYCLE DECISIONS
UPDATE
June 2015
McIlvaine Company
TABLE OF
CONTENTS
Converting from Hydraulic to All-Electric Gas Control
Valves Benefits Frame 6 Owners
Continuous-Blowdown Block Valve Reduces Startup Time
Electric Fuel Control Valve Streamlines Plant
Operations
Integrated Fuel Valve (IFV) Gas Fuel System Upgrade
Keeping Motion Control Systems Operating is Critical
for CCGT
Gas Turbine Electric Valve Actuators
Eliminate Leakage by Drain, Vent, Block Valves
Water-Cooled Check Valves Boost Reliability of 7FA
Liquid Fuel System
Gas Turbine Intake Filters Webinar - Hot Topic Hour May
21, 2015
Inspect Steam Valves for Stellite Delamination
Young & Franklin valves have been
in use on Frame 6 gas turbines for a decade. One advantage of an all-electric
control valve is that it eliminates varnish issues by eliminating the control
oil required by hydraulic actuators. Plus, electric valves are more responsive
than hydraulically operated valves, have greater range, are easier to maintain,
and enhance plant safety.
Revision Date:
5/28/2015
Tags:
221112 - Fossil Fuel
化石燃料, Young & Franklin,
Fuel System, Valve, Combined Cycle Journal
At Essential Power LLC’s Newington
Energy Facility, the high-pressure (HP) steam-drum continuous blowdown system
was designed to cascade flow to the intermediate-pressure (IP) steam drum. While
the valve worked well for controlling flow, it did not have the degree of
leak-tightness required for stopping flow from the drum during typical overnight
shutdowns. An automatic full-port ball valve was installed upstream from the
existing automatic control valve to eliminate the risk of flashing.
Revision Date:
5/28/2015
Tags:
221112 - Fossil Fuel
化石燃料, Valve, Leakage,
Combined Cycle Journal, USA
A Frame 6B-powered cogen plant in
California was plagued with fuel-gas valve problems, usually requiring at least
a man-shift’s worth of work each outage to disassemble, clean seats/plugs, and
reassemble. One solution is to reheat the fuel gas to above the dew point
(120-130F) in between the valves, but this is considered far from ideal. The
better solution proved to be replacing the original valve with a “smart”
electric control valve in the same location as the original and a separate
solenoid-operated stop/isolation valve about 6 ft upstream—just outside and
below the turbine enclosure.
Revision Date:
5/28/2015
Tags:
221112 - Fossil Fuel
化石燃料, Valve, Fuel System,
Maintenance, Combined Cycle Journal, USA
Siemens Industrial Turbomachinery
has recently introduced an upgrade to the gas fuel system for industrial gas
turbines up to 15 MW. The upgrade incorporates an Integrated Fuel Valve (IFV)
assembly and, where applicable, pneumatically actuated fast acting double block
and vent valves.
Revision Date:
5/28/2015
Tags:
221112 - Fossil Fuel
化石燃料, Siemens, Fuel System,
Valve
The challenge for power plants is
keeping their critical motion control systems operating at the same high level
as the original equipment in spite of 24/7 operations in rugged environments.
Moog provides actuators and servo valves to most OEMs of gas and steam turbine
equipment and works with the designers of new turbines to develop
specifications. In addition, Moog provides Global Support repair and maintenance
services and offers special services to help power plants minimize downtime and
ensure optimized performance
Revision Date:
5/28/2015
Tags:
221112 - Fossil Fuel
化石燃料, Moog, Inc./ Ind'l.
Controls Div., Actuator, Valve, Maintenance, Service & Repair, Motion Control
In order to deliver efficient and
dependable gas turbine performance with low operating and maintenance costs,
manufacturers and retrofitters are turning to all electric servo solutions for
their actuator needs, eliminating the need for pumps and tubing normally
associated with hydro-mechanical or pneumatic designs.
Revision Date:
5/28/2015
Tags:
221112 - Fossil Fuel
化石燃料, Exlar, Actuator,
Valve
Select your valves carefully. Be
sure metal seats are available when service temperatures are 400F and above,
stems are blowout-proof, seat leakage meets the tightest specs after
installation, coatings assure long life, and can be accessed internally, inline,
for inspection and maintenance.
Revision Date:
5/28/2015
Tags:
221112 - Fossil Fuel
化石燃料, Valve, Leakage,
Maintenance, Combined Cycle Journal
Owners/operators of dual-fuel gas
turbines often experience coking problems with standard liquid-fuel check
valves. After switching from oil to gas, the oil remaining in check valves,
which are located close to the combustors, is exposed to high temperature.
Water-cooled check valves for the liquid-fuel circuit can help to alleviate the
problem.
Revision Date:
5/28/2015
Tags:
221112 - Fossil Fuel
化石燃料, JASC, Valve, Fuel
System, Coking, Duel Fuel, Combined Cycle Journal
The session covered four route
maps in the Gas Turbine Combined Cycle Air Treatment Guide
Revision Date:
5/21/2015
Tags:
221112 - Fossil Fuel
化石燃料, Air Inlet House, Air
Filter, Air Filtration, Air Intake
Stellite liberation from large
valves installed in high-pressure (HP) and hot reheat (HRH) steam systems
serving F-class combined cycles has emerged as an important industry concern.
EPRI has established a committee on
“Cracking and Disbonding of Hardfacing Alloys in Combined-Cycle Plant Valves” to
dig into the details. The work, funded by several sponsors, began early this
year. John Shingledecker (jshingledecker@epri.com), the technical manager for
this program, said the project timeline is estimated at 14 months.
Tags:
Structural Integrity Associates, EPRI, Valve, Maintenance, Delamination,
Combined Cycle Journal
|
DATE |
SUBJECT |
DESCRIPTION |
|
June
4, 2015 |
Power Plant Valves |
McIlvaine Company
Northfield, IL 60093-2743
Tel:
847-784-0012; Fax:
847-784-0061
E-mail:
editor@mcilvainecompany.com
Web site:
www.mcilvainecompany.com